1 c mayonnaise
1 c freshly grated Parmesan cheese
1/2 c finely diced yellow onion
2 TB sour cream
1 loaf sliced cocktail bread, lightly toasted
Combine mayonnaise, Parmesan cheese, onion, sour cream and Tabasco. Mix thoroughly. If not serving right away, mixture can be refrigerated at this point until ready to use.
Just before serving, preheat oven to broil. Spread mixture evenly on bread slices, place single layer on a baking pan, broil 4 inches from heat for 2 to 3 minutes, or until golden brown.